Probably the only chance these people get to hear the truth about Christ, and that he is Lord and Savior. But, the point she is bringing up is that it wouldn’t be tolerated by muslims.
Why do you say that? It’s the National Cathedral, you don’t think anyone in their can’t just go to a Christian church if they want to? They could just sit there for a little while after all this, and there would probably be a Christian service they wouldn’t even have to leave the building for.